Always thought that the engine needs minimum 10 psi oil pressure for every 1000 rpm.
So a 2000 rpm rated flat head engine needs only 20 psig minimum oil pressure at the gauge when operating at normal operating temperature. 30 psig is better.
That is the reason for the low range oil pressure gauge.
The 9N9273A replacment oil pressure gauge is 0-50 psig. The 20 & 30 numbers on the dial are actually larger than the 10 & 40 psig numbers.
The 0 & 50 numbers are smaller then the 10 & 40 numbers.
Understand the reason to go from SAE 30wt to SAE 15-40 wt or SAE 15-40wt to SAE 20-50wt is to compensate for worn crankshaft bearings.
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Today's Featured Article - It Can't Be Done! - A Tractor Story - by Neil Campbell. I'll never forget the time back when I was a boy baling hay on our Farm in Big Rapid, Michigan. The most memorable event that took place was a trip up the steepest incline on the farm pulling an old New-Idea baler with a pony-motor for power and a haywagon. I had just talked my Dad into buying an old John Deere B with 6-speeds ahead and I was real proud of it, except it was a little smaller than the Case tractor that we normally
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